JPS61169475U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the device of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a developed view of the magnet rotor and armature magnetic poles, and Fig. 4 is an energization control circuit diagram of the excitation coil. , FIG. 5 is a front view of the magnetic poles 5a and 5b, and FIG. 6 is a graph of the output torque curve. 1...Rotating shaft, 2...Rotor, 3a, 3b, 3
c, 3d...fan, 2i...mild steel ring, 2a,
2b,...,2h...Magnetic pole, 6...Exciting coil, 7
...Hall element, 5a, 5b...magnetic pole, 5...magnetic core, B...protrusion of housing, 1a...cup-shaped member, 1b...shaft bearing part, 4...circle, 4a...support body, 9... plastic member having blow-off holes 9a, 9b, 8a, 8b... lead-out terminals, 6a, 6b...
... Coil, 12a, 12b ... Power supply positive and negative electrode, 13
a, 13b, 114a, 14b...Transistor, 5c, 5d...Sub magnetic pole, 15a, 15b, 15
c, 16a, 16b, 16c, 17a, 17b...
...Torque curve.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Annular shape with equal pitch N,
A magnetic rotor having 6 or more magnetic poles in which S magnetic poles are arranged alternately, a cup-shaped member in the center, bases of multiple fans fixed to the outside thereof, and an outer edge of the fan that rotates the magnet as described above. A plastic molded body formed into a circular ring in which a child is buried, a rotating shaft set in the center of a cup-shaped member, and a magnetic plate are bent into a U-shape.
The legs are further bent along the arcuate surface so that the bent ends that become the magnetic poles face the magnetic pole surface of the magnetic rotor mentioned above with a predetermined gap in between, and the length of the arcuate surface is set to the length of the magnetic rotor. A fixed armature having a width approximately equal to the width of the magnetic poles and having an excitation coil attached to the bottom of a U-shaped bent part, a circular ring whose inner circumferential surface faces the outer circumferential surface of the magnetic rotor with a gap in between, and the circular ring. On the opening surface of the ring, a shaft bearing is provided at the center of a support whose both ends are fixed to the ring and rotatably supports the above-mentioned rotating shaft, and a bent end portion of the ring that becomes a magnetic pole is provided. The fixed armature is buried in the outer part of the ring, and the housing is made of a plastic material including the support described above, and the arcuate surface of the arcuate magnetic pole is slightly A mechanism configured to face the different poles of the magnet rotor through a gap, a Hall element provided in a part of the ring of the housing and opposed to the magnetic poles of the magnet rotor, and the Hall element described above. The compact device is characterized by comprising: an energization control circuit that controls energization of the excitation coil by the output of the energizer to generate drive torque by alternately magnetizing the arc-shaped magnetic poles to N and S, and a starting means. electric fan. (2) A protruding part is made to protrude from the side of the two arc-shaped magnetic poles, and the length along the arc surface is approximately half the magnetic pole width of the magnetic rotor, and the protrusion is circular. Item (1), characterized in that the starting means is constituted by a sub-magnetic pole arranged with a phase shift in one direction by 1/4 of the magnetic pole width of the magnet rotor with respect to the arc-shaped magnetic pole. A small electric fan within the scope of the claimed utility model registration. (3) A plastic molded body having one end connected to the open end of a circular ring serving as an air outlet and having a plurality of air outlet holes at the other end; 1. A small electric fan according to claim 1, wherein the fan is comprised of a flexible plastic tube whose end faces an object to be cooled.